216459771 has 16 divisors (see below), whose sum is σ = 315152640. Its totient is φ = 131061920.

The previous prime is 216459743. The next prime is 216459811. The reversal of 216459771 is 177954612.

It is a happy number.

It is not a de Polignac number, because 216459771 - 2¹⁰ = 216458747 is a prime.

It is a super-2 number, since 2×216459771² = 93709664922744882, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (216459871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41041 + ... + 46013.

It is an arithmetic number, because the mean of its divisors is an integer number (19697040).

Almost surely, 2^216459771 is an apocalyptic number.

216459771 is a deficient number, since it is larger than the sum of its proper divisors (98692869).

216459771 is a wasteful number, since it uses less digits than its factorization.

216459771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6306.

The product of its digits is 105840, while the sum is 42.

The square root of 216459771 is about 14712.5718689833. The cubic root of 216459771 is about 600.4254121917.

The spelling of 216459771 in words is "two hundred sixteen million, four hundred fifty-nine thousand, seven hundred seventy-one".